fix(deps): update dependency tslib to v2.8.1 (19.x)

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This PR contains the following updates:

Package	Type	Update	Change
tslib (source)	dependencies	minor	2.7.0 -> 2.8.1

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Release Notes

Microsoft/tslib (tslib)

v2.8.1

Compare Source

What's Changed

• Fix publish workflow by @​andrewbranch in https://github.com/microsoft/tslib/pull/271
• Include non-enumerable keys in __importStar helper by @​rbuckton in https://github.com/microsoft/tslib/pull/272
• Remove use of ES2015 syntax by @​andrewbranch in https://github.com/microsoft/tslib/pull/275

Full Changelog: microsoft/tslib@v2.8.0...v2.8.1

v2.8.0

Compare Source

What's Changed

• Validate export structure of every entrypoint by @​andrewbranch in https://github.com/microsoft/tslib/pull/269
• Add rewriteRelativeImportExtension helper by @​andrewbranch in https://github.com/microsoft/tslib/pull/270

Full Changelog: microsoft/tslib@v2.7.0...v2.8.0

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